Means for cutting grooves in bushings



Aug. 2a, 1932 H. r. mm- 1,872,817 I IIMIS F 0! CUTTING GROOVIS '1BUSHIIGS mu sm. 8. 1950 4 Shuts-Shut 1 I 'IIMIS l'OR CUTTING GROOVE-S INBUSB IIIQS 4 Shoots-Shoot 2 Filed Sept. 8. 1930 QQY Aug. 23, 1932, H. F.ROOT BANS FOR CUTTING GROOVES IN BUSHINGS 4 Sheets-Sheet v 3 Filed Sept.8. 19:50

v 25 zz Aug. 23, 1932. r H. F. ROOT 1,372,817

' IEANS FOR CUTTING GROOVES IN BUSflINGS Filed Sept. 8. 1930 4Sheets-Sheet 4 Patented Aug. 23, 1932 UNITED STATES PATENT OFFICE may I.BOOT, or BUFFALO, NEW 1031:, assieuoa or ONE-THIRD *ro imam c.

EALLEB, OF BUFFALO, NEW YORK m8 FOB CUTTING GROOVESIN- BUSHINGSApplication filed September a, 1930. Serial No. 480,548.

This invention has for its object the provision of a simple andeflicient device whereby oil grooves may be formed in the bores ofbushings rapidly and efiiciently with minimum labor. The inventionprovides a device which may be set in the turret of a lathe andmanipulated without the application ofhigh power to quickl form thegroovesand which may be set to b ject and other objects whichwill'appear in the course of the following description are attained insuch a device as is illustrated in the accompanying'dra'wings andthe invention resides in certain novel features which will be particularlypointed out in the appended claims.

In the accompanying drawings Figure 1 is a front elevation of a turretlathe having thegi-oove cutting device mounted therein. I v 'j Figure 2isan enlarged'top plan view of the device set in a turret lathe; IFigure 3 is an enlarged end "view of the device. i

Figure 4 is line 4-4 of Figure 3. a

Figure 5 is a detail section onthe'line 55 of Figure 3. v I

Figure 6 is a sideelevation of the body of the groove cutting devicewith parts broken away and parts in section. 1

I Figures 7 and 8 are detail views illustrating different adjustments ofthe guide which determines the length and position of the cut.

Figure 9 is a detail section of the cutter.

Figures 10, 11 and 12 are detail sectional views showing difi'erentforms of grooves which may be produced by the device ofthe invention. I

The turret lathe shown at 1 may be of any approved design and includes aturret 2 and collet or chuck 3, the collet or chuck receiving thebushing 4 in which the groove is to be cut and securing the bushing inthe well known manner. In actual practice, any convenient form of stopmay be inserted in the collet or chuck to form an abutment for thebushing so that all the bushings will project from the chuck the samedistance and, consequently, the grooves will be formed ore tapers. Thestated ob-' a'longitudi'nal section on the therein uniformly. The deviceof the invention comprises a body including a relatively stationarymember 5 and a relatively slidable member 6, the relatively stationarymember having mounted upon its outer side a plate 7 '55 from which ashank 8 extends to be engaged in any one of the openings in the turret 2and held therein. The body member 5 hasa rib 9-formed centrally andlongitudinally on its outer face and the plate 7 is oonstructed with 21central longitudinal groove to fit slidably over the rib, as will beunderstood upon reference to Figures 2 and 3, the plate havinglongitudinal slots 10 formed therein through which bolts 11 are insertedto be en- 05 gaged in selected o enings 12 ,formed in the body member 5whereby the plate-will be firmly secured in position, washers '13 beingfitted about the bolts under the heads of the same, as'shown in Figures2 and 3. Sliding adjustment of the device" may be-etfected so as toattain the proper relation between the cutter and the bushing byloosening the bolts 11 and then sliding the body member 5 along theplate 7, after which the bolts are again turned home, the washers 13servin to bridge the slots 10 so that the heads 0 the bolts will exerta: clamping action upon the washers and the plateto bind the same firmlyin the set position against the body member 5. Thebody member 6 isconstructed with a longitudinal dove-tail groove in its side presentedto the body member 5 and said member 5 has a dove-tail rib 14 formed onits coacting face or side to engage in said groove, as shown in Figure3, a gib 15 being disposed at one edge of the rib and the correspondingsidewall of the groove so as to attain the desired close sliding fit. Aplurality of set screws 16 are mounted in the upper side of the bodymember 6 to ass through the same and bear upon the gi 15 to compensatefor wear and maintain the engagementbetween the giband the rib 14. Locknuts 17 are mounted upon the set screws 16 and are turned home againstthe body member 6 to maintain the adjustment in an obvious manner.Semi-circular bores, indicated at 18 and 19,are formed in the opposedsurfaces of the body members 5 and 6 so as to register and house atension spring 20 which acts constantly to move the members 5 and 6longitudinally relative to each other. One end of the coiled spring isfitted about a centering stud or plug 21 which is set in the adjacentend of the bore formed by the grooves 18 and-19 and has a head 22against which the end of the spring abuts, a screw 23 being formed onthe outer end of the head and extending through and being threaded in aplate 24 which is secured to the end of the body member 5. By adjustingthe screw 23 in the plate 24 the desired tension may be imparted to thespring and a lock nut 25- mounted upon the screw will be turned homeagainst the plate 24 so as to hold the screw in the adjusted position.The plate 24 is secured to the body member 5 by screws 26 insertedthrough the plate into the ends of the body member and an adjusting setscrew 27 is fitted loosely through the plate 24 and engaged in athreaded socket 28 provided therefor in the end of the body member 6. aswill be understood upon reference to Figure 4. The screw 27 works inopposition to the spring 20 and by rotating the screw the body member 6may be adjusted relative to the body member 5 to position the cam, aswill presently appear. The end of the spring 20 remote from thecentering stud 21 is engaged over a similar stud 29 which is an integralpart of a plug 30 seated in the opposite end of the bore formed by thegrooves 18 and 19 and said plug 30 is a part of a cam carrying plate 31which is secured to the adjacent end of the body member 6 by screwsorthe like. Disposed centrally upon the cam carrier 31 are verticallyspaced lugs or ears 32 between which is pivotally mounted a cam 33 whichis a substantially triangular block having one corner disposed inapproximate alinement with the center of the plug 30 and said corner isnormally pressed outwardly by a small expansion spring 34 seated in corresponding sockets provided therefor in the opposed surfaces of the camand the cam carrier plate or plug. The cam 33 is designed to coact witha cam guide 35 which is mounted upon the cross slide carriage 36 of thelathe and comprises a shank or stem 37 which is secured to and supportedby the back'tool post 38 of the lathe, the front end of the shank orstem being recessed to provide a seat for the guide 35 upon which theguide is held by a set screw 39. At the back end of the seat or recessin the front end of the stem 37 is a cross bar 40 formed integral withthe stem and having set screws 41 mounted in its ends to bear againstthe back edge of the cam guide 35. By loosening the set screw 39 theguide may be adjusted pivotally upon its seat through manipulation ofthe set bolts 41, in an obvious manner, and the guide may then be heldin the set position by turning the set screw 39 home.

Difl'erent adjustments of the guide are illustrated in Figures 7 and 8of the drawings.

On its side remote from the body member 5, a boss or socket 42 is formedon the body member 6 and this boss or socket receives one end of aboring bar 43 which is held in the socket by a set screw 44 mounted inthe upper side of the same, as shown in Figure 3. The end of the boringbar 43 is formed with an axially extending threaded bore, indicated at45, and with a transverse o ening 46 intersecting the inner end of saibore, as shown in Figure 9. A cutter or bit 47 is seated in the opening46 and is held therein by a set screw 48 mounted in the bore 45, also asshown in Figure 9.

The construction and arrangement 'of the several parts of the ap aratushaving been thus made known, it is t ought the operation will be readilyunderstood. The groove cutting device is mounted in the turret byengagement of the shank 8 in any one of the openings of the turret, ashas been stated, and the stem 37 with the guide 35 is adjusted so thatif the device he moved toward the chuck or collet 3, the projectingcorner of the cam 33 will ride on the front edge of said guide, thespring 34 bein compressed during this movement so that t e cam will beheld by the guide and may move easil The bushing is secured in the chuckor collet 3 and the cross slide of the lathe is adjusted so as to bringthe boring bar 3 into alinementwith the bore of the bushing, after whichthe turret is moved along the bedof the lathe so that the boring bar andthe cutter will enter the bore of the bushing and roduce the desiredcut. If the boring bar and cutter do not enter the bore of the bushingwith just sufiicient clearance to avoid interference, the bolts 11 areloosened and the body member 5 is then shifted just enough to enable thecutter to clear the end of the bushing and enter the bore of the same,after which the bolts are turned home. The body member 6 will, ofcourse, move with the body member 5 and thereby set the boring bar inproper relation to the bushing. The handle on the cross carriage is thenrotated so that the pressure of the cam against the cam guide Wlll causethe cutter 47 to slightly penetrate the wall of the bushing, the camguide 35 being set so as to have the desired contact with the projectingcorner of the cam 33. The turret is then caused to travel along the bodyof the lathe so that the cutter will be pushed inwardly within thebushing and will make an initial cut for the groove. When the out hasbeen made to the desired length, the turret is retracted, the cuttingmechanism being, of course, withdrawn simultaneously therewith, and asecond cut is then made, the cam slide being drawn forward by adjustmentof the cross carriage of the lathe. The set screw 27 permits adjustmentto minimize travel of the body member 6 and facilitate the start of thecam along the cam guide. It also prevents narily t e operation need berepeated only once. The cam guide serves as an indicator to determinewhen the cutter has traveled over the length desired for the oove andthe working edge of the guide wi l have a length corresponding to thelength desired for a groove. In the drawings, the cam guide is shownwith a notch 49 in its working edge Ill.

and this construction permits one guide to be used in cutting grooves oftwo difl'erent lengths. It will be understood that the cam guides are tobe provided in numbers which may be used interchangeabl and when the]cam 33 clears the far end t e guide or engages the notch 49, theoperator will know that the desired length of cut has been made. Duringthe working stroke of the device, the cam is held to the edge of theguide by the 5 rin 34 which is then under com ression and when the endof thecut has been reached, the expansion of the spring will rock thecam so that its projecting corner will engage in the notch 49 or extendpast the corner of the guide, as the case may be. On the return I trip,the cam will impinge against the corner of the guide or against thecorner of the notch, causing it to be rocked back slightly so that thepressure of the cutter against the bushing will be relieved but therewill still be positive contact between the cam and cam guide.

Various forms of grooves may be made in the bushing and in Figure 10 isshown a straight bore bushing 50 having a straight groove 51 formedtherein terminating short of the ends of the bushing, while in Fi re 11is shown a bushing 52 having a straig t bore but having a tapered groove53 formed there- In Figure 12- is shown a bushing 54 having a taperedbore 55 with a straight groove 56 formed therein and terminating shortof the ends of the bushing. Any of the grooves mav, of course, be formedto open through the ends of the bushing. The boring bar will be heldagainst rotation by the set screw 34, but in boring tapered bores thecutter is turned to a position at a right angle to the position shown inFigure 9, and the bushing or work which is in the chuck or collet, isrotated.

It will be readily noted that I have provided a very effective andsimple mechanism whereby the cutter will be held firmly to its work andthe desired work accomplished speedily, accurately and easily.

Having thus described the invention, what I claim is:

1. Mechanism for the purpose set forth comprising a body member having asocket 'posite directions, means for holding the on one side, a cuttercarried b said socket, a second body member slidably tted to the firstmentioned bod member, a shank carried by the second b y member andengageable in the turret of a lathe, a dove-tail connection between thetwo body members, a sprin housedby and between the members at saidove-tail connection and extending longitudinally thereof with its endsacting on opposite ends of and tending constantly to move the bodmembers in opposite directions, and a set bo t carried by the end of onebody member and engaged in the corresponding end of theother body memberwhere y to hold them in set relation. i

2. Mechanism for the purpose set forth comprising a body member havingmeans on one side to receive a cutter, a second body member having meanson one side to be en-' gaged in the turret of a lathe, a slidableconnection between the inner opposed sides of said members, the membersbeing provided at.

said connection with re 'sterin expansion spring house in sai rooves andextendin longitudinally of the y members, a p ug fitted in the groove atone end of the same and carried by one body member, a plu at theopopsite end of the grooves carrie by the other body member, theexpansion spring housed in the grooves being engaged at its ends withsaid plugs, means for ad usting the tension of the s ring, and means forholding the body mem rs in set relation. v

3. Mechanism for the urpose set forth comprising two body mem rsslidably connected at their opposed faces, means tending constantly tomove the body members in o 3 members in set relation, a cutter carriedby the outer side of one body member, a late slidably mounted on theouter side 0 the other body member, means for securing the plate to thelast mentioned body member in set position, and a shank extendin fromsaid plate to be engaged in the turret o a lathe.

4. Means for the purpose set forth comrising a body, means on one sideof the body or supporting the body in the turret ofalathe,

a cutter carried by the opposite side of the body, a cam pivotedeccentrically at one end of the body, a cam guide atone side of the bodyto be engaged by said cam whereby to mark the length of travel of thecutter, and a spring housed between and acting on the end of the bodyand laterally projecting end of the cam.

5. Means for the purpose set forth comprising a body member having acutter-receiving grooves, ai.

socket on one side and provided on its opposite side with a dove-tailgroove extending from end to end thereof, asecond body member providedon one side with a dove-tail tongue slidably fitting in the dove-tailgroove of the first-mentioned member and provided on its opposite sidewith a cetral rib extending from end to end thereof, the two membersbeing provided with mating grooves in their meeting faces extendin fromend to end of the dove-tail tongue an the dove-tail groove respectivel acam-carryin plate secured to one end one body mem er and provided with aplug fitting in said mating grooves, a cam mounted on said plate, a camguide along which the cam may ride, a plug fitting in the matmg groovesat the opposite ends of the body members, an expansion spring fitted toand extending between the plugs and housed in the mating groot'es, aplate secured to one body member and extendm across the outer end of thelast-mentione plu a screw mounted in said plate and engage in thelastmentioned plug, a set bolt mounted in said piate and threaded intothe other body memr, a holding plate fitted on the rib on thesecond-mentioned body member and provided with longitudinal slots overthe rib, securing devices inserted through said slots into the rib, anda shank extending from said plate to be held in the turret of'a lathe.

In testimony whereof, I afiix my signature.

HARRY F. ROOT. [L. 5.]

